31861152 has 36 divisors (see below), whose sum is σ = 90605970. Its totient is φ = 10620288.

The previous prime is 31861147. The next prime is 31861153. The reversal of 31861152 is 25116813.

It can be written as a sum of positive squares in only one way, i.e., 30869136 + 992016 = 5556^2 + 996^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (31861153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55027 + ... + 55602.

Almost surely, 2^31861152 is an apocalyptic number.

31861152 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31861152 is an abundant number, since it is smaller than the sum of its proper divisors (58744818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31861152 is a wasteful number, since it uses less digits than its factorization.

31861152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110645 (or 110634 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 31861152 is about 5644.5683625943. The cubic root of 31861152 is about 317.0203624466.

Adding to 31861152 its reverse (25116813), we get a palindrome (56977965).

The spelling of 31861152 in words is "thirty-one million, eight hundred sixty-one thousand, one hundred fifty-two".